Rotary metering valve for diesel engines



Sept. 1 8, 1945. `s. LERNl-:R-

ROTARY METERING VALVE FOR DIESEL ENGINES F iled May 20, 1943 az- I.- `27 INVENTOR.

er/2er l 2a a 6 14 T1995'.

5 ATmR/VEY Patented Sept. 18, 1945 AUNITED- sTATEfs PATENT ,OFFICE ROTARY METERING vALvE FOR DIESEL ENGINESl *I j Sanley Lerner, BronxyN. Y;v Application May zo, 194s, sei-inno. 2,187,828 l s Claims. (C1. avv- 46X This invention relates to new and useful im, provements in a rotary metering valve for Diesel engines. e'

' More specifically,l the` inventonproposes the constructionof Aa rotarymetering valve for Diesel engines characterized by a body having one or more fuel discharge ports (one for each cylinder of the engine)l starting 4from a bore in the housing for a slidablerand rotative cylindrical valve head designed in a manner to convey equal amounts of'iuel from an inlet port successively to each ofl said discharge ports.

Still further itis Vproposed to provide `the cylindrical valve with a metering groove of a-particular shape, and alignable with one or more of 'the disizha'rg'e,A .ports in various axial shifted positions for controlling lthe duration of, injection in a manner toperr'nitthis period of-injecf tion to be changed by merely shifting the valve head relative to therhousing. I l' 'v Another, object of the invention proposes 'the provision of passages for connectingthe fuel inlet port with metering grooves in all-rotative vpositions -of said valve head in a manner to continually supply fuel to saidrnetering groove.l

A further object of.. vthe invention`4 proposes'the provision of a fuel bypass return port connected with the fuel discharge ports uby means of a passage and pressure regulating valve arranged in a manner to maintain predetermined residual presisure in a dischargeline during the period between injections. i

. Still another,Y object of the invention proposes the provision of "a lcut oi,port foreach of the passages connecting the discharge ports with the f vfuel bypass return port; anda landy projectionon Athe valve alignable=with the cut oii ports for closing the cut off port of each fuel discharge port; during the time the metering groove'is aligned with1 the discharge porttofprevent Vthe Vi'uel being. supplied to the discharge portiunder pressure from escaping through the fuel bypass return port.

. Itis further proposed to constructtlie land 'pro' design, less costly'to manufacture and requires less material and work since only one metering valve is normallyrequired for the entire engine,

For further comprehension of the j invention, and of the objects and advantages thereof, reference will be hadv to the following description and accompanying Vdrawing, and to the appended claims in which the Vvarious novel features ofthe invention are more nparticularly set `forth. 'y e lnthe accompanying, drawing forming a material part of this disclosure:v j e Fig. 1 is a longitudinal sectional View oi a rotary metering valve for Diesel engines constructed in accordance with this invention.

` Fig, 2 is `a sectional view taken on the line 2-2 ofFig. l.

Fig. `3 is avertical ofFig. 1. l

Fig. 4 is a vertical sectional View on the line II---4ofFig..1.Y Y y Fig. 5 is a verticalsectional view of pressure regulating 4valve ofthe bypass return port. e.

Fig. 6 is a view similar to Fig. 1 but'illustrating a rnodication of the invention.'

Fig. 7 is a horizontalsectional view taken on the line 1,-1 of Fig. 6i. A' L y 4 'The rotary metering -valve for Diesel engines, accordingtolthis invention, includes a body I 0 having one o1"A more fuel discharge ports I I startseciionai vView of theiiiie V3*-3 ing from a bore I2 in the body I0 and radiating i this is by Way of illustration only, land that in arc'- jection'to coincide Ywith Vthe shape and size of I the metering groove but slightly wider to keep the cut off port closed for a, period before andA after the metering groove'uncovers the respective dis,-

charge'port in a manner to prevent the pressure in the` line from the pressure pump lfrom dropping 'before' andafter theinjection.

' n is siin another object of this invention'. t constructa rotary metering valve. for a Diesel engine which is inherently, much less intricate in tual practice there willbe one discharge port II for each ofthe cylinders' of the Diesel engine. That isz'` If the engine has sixvcylinders there will be six discharge ports in the housing IU; The'bore I2 of the housing carries a'slidable and rotative cylindrical valve head I3 which cuts 01T the entrance to the dischargeA ports II. The valvehe'ad I3 is adapted to .be rotated by an external source of power*-(not shown on the drawing) and properly timed -to'the engine and its axialslidable 'movementis' controlled by aAgov-vernorinot shown onfthe drawing) for a purpose which will hereinafter become clear as this speciiication" proceeds. Details of the'rotating and sliding mechanism are not shown on `the drawing 'as' theyform no part of this invention and such devices are generally known to those skilled' in the art. i y

The valve head I3 is formed with a metering groove I4 which iswider. at one end' than the other and arranged to` be aligned with lone or more of the discharge ports 4I I during rotationof which is adapted to be connected with a pressure Y Ypump (not shown von the drawing) for supplying fuel oil under pressure. Passages'connect the metering groove I4 with the fuel inlet port I5 in all'positions of the valve head for continually" supplying fuel under pressureV to qthemetering groove I4. These passages are characterized ;by .c

an opening I6 which extends from the inlet port I5 to the bore I2. The opening IIS-isaligned,

in all shifted positions of the valve head-I3 con-' nected with a circular groove I1 formed inthe port I9 is formed with a cut off port 34. These cut olf ports 34 are located in the branch passages at the point where these passages 20 contact the bore I2. With this construction the land projection 33 is alignable with the cut off ports 34 during the rotation of the valve head I3 and in all shifted positions thereof. Thus, the land projection 33 will close the cut ofl port 34 of each fuel'discharge port II approximately `during the time that the metering groove I4 supplies each of the discharge ports I I with fuel during the in- Vljection period. lMaking the land projection 33 largerthan. the metering groove I4 insures closling of the cut off port 34 a fraction of a second before the injection period starts and opening of Y'the' cutoff port 34 a fraction of a second after valve head I3 adjacent the metering groove I4.'

The circular groove I 'I is in turn connected with the metering groove `I4 by an angularV opening IB extended through the valve head `I 3 from thecircular groove I1 to the metering ,groove I4. c

The body I0 is also formedwitha fuel bypass return port I9 which is-connected with eachfofy the one or more fuel dischargey ports II by passages. These latter. passages are characterized by'branch passages V2l) extending from an intermediate portion of the discharge portsv Il tothe bore I2. These branch passages 20 are aligned in all shifted positions of the valvehead `I3 with a circular groove 2| formed in the valve head I3. A passage 22 then connects the groove 2|, in all shifted -positionsof the. valvehead I3, with the fuel bypass return port I9. Y l'Ihefuel bypass return port I9 is connected with the inlet to the pressure pump (not shown on the drawing)v -orreturned to thefuel tank by ay pipe 23. Arranged in conjunction with the bypass return port ISL-and more specifically in an intermediate portion of the .pipe23, thereis a pressure regulating valvel-24Iforregu1ating thepressure in the fuel discharge ports I -I `during the time that no injection is taking place. l c

The pressure regulatngvalve- 24 is character-f ized by a housing 25A mounted in the housing I0 and formed withy anV internal valve seat26.`v .A screw 21 threadedly engages the housing 25 at a point opposite the valve seat 26. rrA valve member 28 -is engageable upon the seat-26 vand has a stem 29projectingtherefrom and which slidably engages into an opening 30 formed inthe inner vend of the screw v2'I. An expansion spring A3I is1co`faxial-ly engaged upon the-stem 29 Vand bears bel tween opposite'facesrof the valve member 28v and the inner endV ofthe screw 21 to urgev the valve member 28 vinto a seated position on the valveseat 26 toclose the passage through the pipe 23.

YAdjustments.made to Vthe screw 21 will control the .pressure exerted by theV spring-3| `in vseating the valve member 2S upon the valve seat 26.A nut'32 threadedlyengagesthe screw 21 and is arranged to be tightened against the body 25 for holding the screw 21 in any ldesired .adjusted position.. v

A land projection 33 is formed onA the valve head I3. .This land projection 33 "is vformed'onthe valve'head I3 "in an aligned-'position With the metering groove I4 and .is of 'a similar shape, that is; smaller at one end than the other. However. this land projection is of a size slightly greater than the metering groovev I4. Each of the passages which connects the fuel dis-charge ports' ||j with the fuemypass return Ymetering vgroove'and .cut Volf land-'projection'in the injection period stops to prevent the pressure in the'line from the pressure pump from dropping before 'and after the injection period.

The operation of this invention is as follows.: Fuel from the pressure vpump enters the inlet ,port` I5 and proceeds' tothe rmetering groovel I4 through the passages I 6I'I andIS. Injection begins when the metering groove' I4 uncovers the discharge port II as the. land vprojection covers the cut off port 34 of thel particular discharge port' Il'which'has been'uncovered.; '4 The duration of the injectionl period isfcontrolled by the lateral width of the metering groove I4 which 'i's'alig'ned with vthe entranceto the discharge port 'II.l Aligning Vdifferent,portions of. the metering groove I4 with ,theA dischargepor'ts is controlled by shifting the valve head relative; to thebodyln. y v ln'jection'stops whenfth'e discharge port II.is again closed and 4'the landhprojecton 33 kmoves clear of the' cut off port v34 openingv the'port. Pressure within the dischargexport II is maintained bythe-valve '24.` If the pressure inthe discharge II is greater than th'epre'ss1.1re':`,for vwhichY the valvel 24 is provided, 'this pressure vwill back up' throughvr the fuel lbypass return portl I 9 and unseat the vvalve memberg28vrpermittingvlthis additional Ipressure to. passfthrough the. pipe'23 back to the inlettothe pressure pump. 4 v --In'the modification' o'fthefinvention shown in Figs. o' -and"'1,1 the 'construction' V ofthej'rotary metering valve vfor Dieselengines isjsimijlar-to'that previously described, except''for 'the 'means for connecting the circular kgroove fII/in the',fvalve vhead I3 with the meteringgroove I 4; j A",

In this form oftheinventipn, this connecting ymeansv is: characterized by Y a vgroove I 8'] formed inthe face of the valve Vhead I3`lbetween`the cir,- cular'g-roove I'I and the metering Vgroove I4.

f In `other respects fthis'f form ,of the invention is similarV to that fpreviously'fshownj and like refer. ence'fnumerals identify like parts'in eachof'the fseveralviews." 'Y l "if fThis device mayialso beconstructed'fwithftlie the boreof the housing .instead of in the valve head.

The device. is not-.limited to usein Diesel'ngines.v It may.v be usedLwherever'equal quan- .tities4 of liquiderv gas, to V`any mechanism is .desired. 1 .qnwykf' It may also be `used *without pressure regulate `ing valve, if so desired, orindiyidual checkwalves mayalso be `.employed-in `each,cli sczherge line.. The valve mayY seal; leakagein the housing by accurately fitted parts or conventionalhigh pressure packing glands. A l v. 1 [While 1 have illustrated and. .described the prelferred embodiments of' my invention, it isV toY be agsssgoae understood that I do not limit myself to the precise constructions herein disclosedand the right is reserved to all changes and modifications coming Within the scope of the invention as deiined in the appended claims.

Having thus described my invention,A what I claim as new, and desire to` secure ,by United States Letters Patentis: i

l. A rotary metering valve for Diesel engines, comprising a body having one or more radially disposed fuel discharge ports starting froma bore therein for a slidable and rotative cylindrical valve head, a slidable and rotative cylindrical valve head within said body and cutting off said discharge ports, said valve head having -a metering groove alignable separately with'said one or more fuel discharge ports during its rotation, said meteringgroove'being longer than the diameter of said discharge ports and having its length extended parallel to the length of said cylindrical valve head, said body having a fuel inlet port, passages connecting said fuel inlet port with said metering groove in all positions of said valve head, said body having a fuel by-pass return port, passages connecting each of said' one or more fuel discharge ports with said fuel bypass return port and including a cutoii port for each of said one or more fuel discharge ports. and a land projection on said valve head and of similar shape and approximate size to said metering groove and alignable separately With'said cut off ports While said metering groove is aligned separately with the corresponding cfsaid discharge ports, whereby when said valve head is slid relative to said'body to align a different.v area of said metering groove with said `discharge ports, said land projection will be similarly -mo'ved to align a complementary portion of said land projection with the corresponding of said cut off ports.

2. A rotary metering valve for Diesel engines, comprising a body having onevor more radially disposed fuel discharge ports starting from a bore therein for a slidable and rotative cylindrical valve head, a slidable and rotative cylindrical valve head within said body and cutting off said discharge ports, said valve head having a metering groove alignable separately with said one or more fuel discharge ports during its rotation, said metering groove being longer than the diameter of said discharge ports and having its length extended parallel to the length of said cylindrical valve head, said body having a fuel inlet port, passages connecting said fuel inlet port with said metering groove in all positions of said valve head, said body having a fuel by-pass return port, passages connecting each of said one or more fuel discharge ports with said fuel by-pass return port and including a cut oi port for each of said one or more fuel discharge ports, and a land projection on said valve head and of similar shape and approximate size to said metering groove and alignable separately with said cut ofi ports while said metering groove is aligned separately with the corresponding of said discharge ports, whereby when said valve head is slid relative to said body to align a different area of said metering groove with said discharge ports, said land projection will be similarly moved to align a complementary portion of said land projection with the corresponding of said cut off ports, said metering groove being wider at one end than the other for controlling the amount of fuel that Will be delivered to the discharge ports -inggroove 1 as the valve head is shifted longitudinally `rela.- tivetotliebody i '3. VAA rotary metering Valve for Diesel engines, comprising fa body having one or more' radially disposed fuel discharge ports starting l'from a bore therein for 'a slidable and rotative cylindrical valve head, a slidable and rotative cylindrical valve head Within said body'iand cutting ofi-said discharge ports, said 'valve head havinga meter- .ing groove ali'gnable separately with .said one" or more fuel discharge ports during its rotation, said metering groove being longer' thanthe diameter of said discharge ports and having its length extended parallel to'the lengthof saidcylindrical valvehead, said bodyrhaving a fuelI inlet port, passages connecting said fuel inlet port 4with said metering groove in all' positions of4 said valve head, said body having a fuelby-pass return port, passages connecting each of said one .ormore fuel discharge ports with said'iuel oy-'pass return port and includingv a cut off port for each of said one or more fuel .discharge ports, and a-land projection on said valve head and of similari shape and 'approximatev size to said metering groove;and

alignable separately'wthsaid cut oif'por'ts while said meteringv groovle is aligned separately with the corresponding of said discharge` ports, Whereby when said valve head is slid relative to said body to align -a dierent area of said metering groove with said discharge ports, saidvl'and. projection will be similarly moved to `align a complementary portionv of said land projection with thex corresponding ofI 'said cut olf ports, said first mentioned passages comprisingan opening leading from saidA inlet port through said bodyxto said bore, 'a circular groove formed in said valve head and communicating `withV said opening inial1 shifted positions'of said valve head, and means connecting said circularfgroove-with saidmeter- 4. A rotary metering valve for Diesel engines, comprising a body having one or more radially disposed fuel discharge ports starting from a bore therein for a slidable and rotative cylindrical valve head, a slidable and rotative cylindrical valve head within said body and cutting olf said discharge ports, said valve head having a metering groove alignable separately with said one or more fuel discharge ports during its rotation, said metering groove being longer'than the diameter of said discharge ports and having its length extended parallel to the length of said cylindrical valve head, said body having a fuel inlet port, passages connecting said fuel inlet port with said metering groove iniall positions of said valve head, said body having a fuel by-pass return port, passages connecting each of said one or more fuel discharge ports with said fuel by-pass return port and including a cut off port for each of said one or more fuel discharge ports, and a land projection on said valve head and of similar shape and approximate size to said metering groove and alignable separately with said cut off ports while said metering groove is aligned separately with the corresponding of said discharge ports, whereby when said valve head is slid relative to said body to align a different area of said metering groove with said discharge ports, said land projection will be similarly moved to align a complementary portion of said land projection with the corresponding of said cut olf ports, said first mentioned passages comprising an opening leading from said inlet port through said body to said bore, a circular groove formed in said valve head and communicating with said opening in all shited'positions of saidv valve head, land means connecting said circular groove with said; metering groove, said latter means, comprising an annularoponing extended throughV said valve head romsaid circular `groove'to said metering groove. 5. A rotarymetering valve :for Diesel engines, comprising `a ibody having one or more radially disposed `fuel discharge ports starting from'a bore therein for Ia slidable and rotative cylindrical valve head, a slidable and rotative cylindrical valve head within said body and cutting oil said `discharge Vporta-'said valve head having a metering groove lalignalole separately with said one or more fuel discharge p'orts during its rotation, said metering groove-'being longer than the diameter of said discharge ports and having its length extended parallel to the length -ofv said cylindrical valve head, said body having a fuel .inlet port, passages connecting said fuel inlet port with said metering groove in all positions of said valve head, ysaid body Y'having a fuel by-'pas's returnport,` passages connecting each of said one vox'vniore fuel discharge portswith said fuel bypass return port and including a `cut ofi lport for each of said one or more fuel discharge ports, and a. land `projection on said valve head and of similar shape and approximate size to said metering groove and alignable separately with said cut off ports' while said metering groove is aligned separately-with the corresponding of 'said discharge ports, whereby when said valve head is slid relative'to said body to align a different area "of said metering groove with said discharge ports, said land projection will be similarly'movedto align a complementary portion of said land projection with the' corresponding of said cut oi ports, said cut-off ports comprising fbranch passages connecting each of said discharge ports with said bore, uavcircular groove formed in .said

assignee sagesdin all shifted positions of said 4valve head and `during the'time that said land projection is `disaligned' therewith, :and a passagein said body connecting Vsaid circular lgroovefwith said bypass return port. r

' 6..-A rotary metering valvev for .Diesel engines, comprising a body having one 1in-more radially disposed fuel dischargepports start-ing 4from a bore therein for a slidable and `rotative cylindrical valve head, a *slida'blel and rotative .cylindrical valve-head Within said .body and cutting off said discharge ports, said valve `head having: a metering groove alignable lsepara-tely'vvith Vsaid, one or more fuel discharge ports during its' rotation, said metering Igroove being lon-ger than the-diameter vof said discharge ports and-1havingits length extended parallel to the length of said cylindrical valve head, said bodyfhaving a fuel inlet port, passages connecting-fsaid fuel inlet port with .said metering groove ineallpositicns of saidv valveY head; said body having 'a fuel fby pass return port, passages connecting each of said one or more fuel discharge ports with said fuel valve head and connecting with said branch pas 40 bypass return port and including -a cut oii pont for each of said `one or more fuel discharge ports, and a land projection -on-said Vvalve .head and of similar shape and approximate size to sai-d metering groove and alignable-separately withl said cut off ports while said metering groove is'aligned separately withy the corresponding ofsaiddischarge ports,` Wherebywhen said valve head is slid relative `to said body to align adifferentarea ofsaid metering' groove with said discharge ports, said land projection will be similarly moved to align a complementary portion' .of said land pro jee-tion with the corresponding of said cut off ports,and a pressure regulating valve in said' bypass return port. Y Y l y lserum-:Sry Lantern`.vv 

